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Windows Managers will not launch from login

I had been having conflicts between certain packages on fedora-multimedia vs RPMFusion so was trying to tweak things so that it wouldn't mess up an upgrade to Fedora 27. However, somehow now I cannot get into any Window Manager from logging into KDM or SDDM, it just kills Xorg and goes back to the login screen.

I have been checking all the packages and cannot find a problem, I cannot find any errors in the logs to indicate a problem. I even forced a reinstall of every package which didn't make any difference.

I tried KDE, Gnome, Gnome on Xorg and xfce - all fail to start if choosing them as a session. The really weird thing is if I go into the failsafe session and then launch startkde from there, it seems to work perfectly.

Any ideas where I should be looking for the problem? Its worth noting that logging into the console as a user then issuing startx doesn't work either, so maybe an indication of where things are going wrong?

Obviously there is the option to just install Fedora 27 fresh tomorrow, an upgrade may even fix it on its own, but I always prefer to know what went wrong just in case it happens again.

Re: Windows Managers will not launch from login

Originally Posted by alexatkin

I have been checking all the packages and cannot find a problem, I cannot find any errors in the logs to indicate a problem.

I guess you've looked in X's log file where, if X doesn't start, the errors are logged in /var/log/Xorg.0.log. I wonder if there's any useful info at all in that log file, especially on the failure of the startx command.